A device for extracting a tool holder from a base block mounting has a front plate and a pair of rearwardly extending arms contacting the base block mounting. An extraction nut has at least two parallel threaded holes therein. A threaded stud is threaded into one of the threaded holes and the length extends through a hole in the front plate and through the tool holder and is retained by a nut. An extraction bolt is threaded through the second threaded hole of the extraction nut with the distal end engaging the front plate.
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8. A device for extracting a quick-change tool holder from locking engagement with a base block mounting of a machine wherein said quick-change tool holder has a forward surface, a rearwardly extending generally cylindrical shank, a rearward end, and an axial bore extending into said forward surface and through said generally cylindrical shank to said rearward end, and said base block mounting has a body with an outer surface, a forward surface, a rearward surface and a central opening extending from said forward surface to said rearward surface, said shank of said quick change tool holder being tightly fitted within said central opening of said base block mounting, said device comprising
a front plate,
a first arm and a second arm extending rearwardly from opposing ends of said front plate,
contact surfaces on rearward ends of said first and second arms for engaging opposing portions of said outer surface of said base block mounting,
said front plate having a transverse hole therein,
a threaded stud having a forward end, a rearward end and a length,
an extraction nut having a threaded hole therein for threadedly receiving said threaded stud,
said extraction nut threaded on said forward end of said threaded stud,
said length of said threaded stud rearward of said extraction nut extending through said transverse hole and through said axial bore,
a leveraging tool applying force between said extraction nut and said front plate, and
a retaining nut threaded on said rearward end of said threaded stud wherein said leveraging tool will urge said transverse head away from said front plate and draw said quick change tool holder out of said base block mounting.
1. A device for extracting a quick-change tool holder from locking engagement with a base block mounting of a machine wherein said quick-change tool holder has a forward surface, a rearwardly extending generally cylindrical shank, a rearward end, and an axial bore extending into said forward surface and through said generally cylindrical shank to said rearward end, and said base block mounting has a body with an outer surface, a forward surface, a rearward surface and a central opening extending from said forward surface to said rearward surface, said shank of said quick change tool holder being tightly fitted within said central opening of said base block mounting, said device comprising
a front plate,
a first arm and a second arm extending rearwardly from opposing ends of said front plate,
contact surfaces on rearward ends of said first and second arms for engaging opposing portions of said outer surface of said base block mounting,
said front plate having a transverse hole therein,
a threaded stud having a forward end, a rearward end and a length
an extraction nut having a first threaded hole therein and a second threaded hole parallel to said first threaded hole
said forward end of said threaded stud threadedly received in said first threaded hole,
said length of said threaded stud rearward of said extraction nut extending through said transverse hole and through said axial bore,
a retaining nut threaded on said rearward end of said threaded stud,
a jack screw having a head, a threaded portion and a distal end,
said jack screw threaded through said second threaded hole with said distal end against said front plate wherein rotation of said head of said jack screws will draw said generally cylindrical shank out of said base block mounting.
9. A device for extracting a quick-change tool holder from locking engagement with a base block mounting of a machine wherein said quick-change tool holder has a forward surface, a rearwardly extending generally cylindrical shank, a rearward end, and an axial bore extending into said forward surface and through said generally cylindrical shank to said rearward end, and said base block mounting has a body with an outer surface, a forward surface, a rearward surface and a central opening extending from said forward surface to said rearward surface, said shank of said quick change tool holder being tightly fitted within said central opening of said base block mounting, said device comprising
a front plate,
a first arm and a second arm extending rearwardly from opposing ends of said front plate,
contact surfaces on rearward ends of said first and second arms for engaging opposing portions of said outer surface of said base block mounting,
said front plate having a transverse hole therein,
a threaded stud having a forward end, a rearward end and a length,
a transverse head on said forward end of said threaded stud,
said length of said threaded stud rearward of said transverse head extending through said transverse hole and through said axial bore,
said transverse head having a threaded hole therein, said threaded hole extending parallel to said length of said threaded stud,
a bolt having a transverse head, a threaded shank and a distal end,
said threaded shank of said bolt threaded through said threaded hole in said transverse head wherein said distal end of said bolt applies force against said front plate,
a retaining nut threaded on said rearward end of said threaded stud wherein said leveraging tool will urge said transverse head away from said front plate and draw said quick change tool holder out of said base block mounting.
2. The device of
said distal end of said second arm abuts a surface on said base block mounting.
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This is a continuation-in-part of my application filed Nov. 29, 2004 and assigned Ser. No. 10/998,432 now abandoned. The present application relates to quick-change tool holders for receiving rotatable tools on a machine for cutting hard surfaces, and in particular to a device for extracting a worn out quick-change tool holder from a base block mounting on a machine.
Machines used for cutting hard surfaces, such as concrete and asphalt pavement, rock and the like, employ rotatable tools having a tapered forward cutting end behind which is an axially extending shank rotatably fitted in a tool holder. Where a quick-change tool holder is employed, the tool holder itself has a tapered forward end behind which is an axial shank that is received in the bore of a base block mounting on a machine. Base block mountings are secured to a rotatable wheel or drum, which forces the forward cutting ends of the tools retained in the various tool holders against the hard surface to be cut.
Where such tools are used to cut hard material such as asphalt or concrete, the tools retained in the quick-change tool holders must rotate to wear evenly around their circumference and thereby maximize their useful life. The hard material engaged by such tools none the less wears the tool rapidly. When the machine is used to cut hard surfaces it is common to replace the tools therein at least once a day. The same hard use that causes the tools to become rapidly worn eventually causes wear to the tool holders that receive the rotatable shanks of the tools. Although the life expectancy of such tool holders may be one hundred times or several hundred times the life of the tools received therein, extended usage of a machine will result in the tool holders becoming worn and requiring replacement.
It has become common to use a quick-change tool holder having a tapered forward end and an axially rearwardly extending shank that is received in a complementarily shaped bore of a base block mounting on the machine to simplify the replacement of worn tool holders. The distal end of the shank of the quick-change holder is threaded and extends beyond a rearward surface of the base block mounting, and a nut threaded on the distal end of the shank retains the quick-change tool holder in the base block mounting. Preferably, the quick-change holder is of the type disclosed in my previously issued U.S. Pat. Nos. 6,371,567 B1 and 6,585,326 B2, which are incorporated herein by reference.
Ideally, such quick-change tool holders are easily removed from the base blocks on the machine by using a punch and hammer to withdraw the shank out of the bore of the base block mounting. The strong forces applied to the tools, the tool holders, and the base block mountings, as the machine cuts hard surfaces, however, can cause the various parts to become deformed such that the shank of the quick-change tool holder can't be easily extracted from the bore of a base block mounting. The hard material cut by the machine also produces fines that work their way between the surfaces of the various parts and further inhibit the movement of one part with respect to another. As a result of the forgoing, it is often difficult to remove the shank of a quick-change tool holder from the bore of a base block mounting.
Presently, it is the practice to use a hammer and a punch or the like against the distal end of the shank of the tool holder to drive the shank out of the bore of the tool holder. Where the shank has become tightly bound into the bore of the tool holder, however, driving a worn shank out of a tool holder may be exceedingly difficult.
An alternative method of extracting such tool holders is to apply a tool against the radial flange that defines the rearward end of the tapered forward portion of the quick-change tool holder. The tool holder may include a notch or another configuration to allow the forward end of a punch or the like to be applied to the rear surface of the radial flange and facilitate the removal of the quick-change tool holder.
It sometimes occurs that the tapered forward end of a quick-change tool holder will become broken off during usage, leaving the shank thereof still lodged in the bore of the mounting block. In such a case, a machine operator cannot use a punch and hammer against the rear surface of the radial flange to remove the remnants of the shank of the quick-change tool holder and is limited to using a punch to drive the remnants of the shank forward through the bore.
It is also difficult for a machine operator to reach all the base block mountings for which the quick-change tool holders must be replaced. To improve the accessibility of the various base block mountings and tool holders, the operator must periodically operate the machine to partially rotate the drum and thereby bring previously inaccessible base block mountings into his reach. Where a damaged quick-change tool holder must be pounded out of its mounting block, the drum must be rotated so that the damaged parts are most accessible to the operator before removing the worn part. The process of removing damaged quick-change tool holders, therefore, can consume a great amount of time. Such down time has been greatly reduced by the provision of the quick-change tool holders, but it would, none the less, be desirable to provide an improved method and apparatus for removing a worn quick-change tool holder from a base block mounting. It would be further desirable to provide a method and apparatus for removing the remaining shank of a quick-change tool holder after the forward end thereof has been broken off.
Briefly, the present invention is embodied in an extraction device for removing a quick-change tool holder from a base block mounting. The quick-change tool holder is of the type having a forward surface, a rearwardly extending generally cylindrical shank with a rearward end, and an axial bore extending into the forward surface through the length thereof including the cylindrical shank and opening at the rearward end. The base block mounting has a body with an outer surface, a forward surface, a rearward surface, and a central opening extending from the forward surface to the rearward surface. The base block tightly retains the shank of the tool holder in the bore thereof, and the tool holder in turn removably retains a rotatable tool.
The device of the present invention is used to separate the quick change tool holder from the base block mounting. The device includes a front plate having a first end and a second end. An upper arm extends rearwardly from the first end of the front plate, and a longitudinally adjustable second arm extends rearwardly from the second end of the front plate with the rearward ends of the two arms having attachment surfaces that engage attachment surfaces on the base block mounting.
In the preferred embodiment a hardened pin extends radially inward from the rearward end of the upper arm. The axis of the pin is perpendicular to the axis of the bore of the base block mounting from which a quick change tool holder is to be extracted and the rearward end of the upper arm is radially moveable relative to the axis of the bore between a first position in which the distal end of the pin is spaced from the surface of the base block mounting and a second position in which the pin extends into a radially inwardly directed hole in the base block mounting for securing the second end thereto.
The device further includes an extraction nut having a first threaded hole therein and a second threaded hole parallel to and spaced a short distance from the first threaded hole. An elongate threaded stud has the forward end thereof threaded into the first hole of the extraction nut and the second end of the threaded stud is extended through a transverse hole in the front plate and then through the axial bore of the quick change holder. The rearward end of the threaded stud extends outward of the rearward end of the shank of the tool holder and a retaining nut is then threaded on the rearward end of the stud.
The device further includes a jack screw having a head, a threaded portion, and a distal end with the threaded portion of the jack screw threaded through the second threaded hole of the extraction nut and the distal end of the jack screw abutting the front plate or a washer member sandwiched between the front plate and the extraction nut. Rotation of the head of the jack screw will then urge the extraction nut away from the front plate and extract the quick-change tool holder from the base block mounting.
A better understanding of the invention will be had after a reading of the following detailed description taken in conjunction with the drawings wherein:
Referring to
Fitted into the bore 22 of the base block mounting 10 is a quick-change holder 28 having a forward shield portion 30 that diverges radially outwardly from a planar forward surface 32 and reaches a maximum diameter at the rearward end 33 of the shield portion 30. Behind the rearward end 33 is a rearwardly directed annular flange 34. Extending axially rearwardly of the annular flange 34 is a generally cylindrical shank 36, the outer profile of which is shaped and sized to create an interference fit with the bore 22 in the tubular body 16 of the base block mounting 10, as explained in my U.S. Pat. Nos. 6,371,567 B1 and 6,585,326 B2. At the rearward end of the cylindrical shank 36 is a transverse rear surface 38.
Extending axially through the length of the quick-change holder 28, including the shield portion 30 and the generally cylindrical shank 36 is an axial bore 40 having an inner diameter sized to receive the rotatable shank of a cutting tool, not shown. The quick-change holder 28 also has within the axial bore 40 a slideable plunger 42 retained therein by a pin 44, which will facilitate the removal of the shank of a rotatable tool, not shown, retained within the forward portion of bore 40. The shield portion 30 of the quick-change holder 28 also has at least one indentation 46 therein for receiving the end of a tool to aid in removing the quick-change holder 28 from the base block mounting 10.
When in use, the cylindrical shank 36 of a quick-change holder 28 is fitted into the axial bore 22 of the base block mounting with the annular flange 34 of the quick-change holder 28 generally abutting against the forward surface 18 of the base block mounting as shown in
Referring to
Where the parts of the extraction device 50 have an orientation that is parallel to the axial bore 40 of the quick-change holder 28 the portions thereof that are directed toward the left as depicted in
The rearward end of the upper arm 60 has a transverse hole 72 therein having a diameter smaller than the diameter of the transverse hole 24 in the base block mounting 10, and a cylindrical pin 74 is press fitted into hole 72 with the distal end thereof directed toward and perpendicular to the axis of the bore 24 of the base block mounting 10. An important feature of the preferred embodiment is that the rearward end of the upper arm 60 is radially moveable with respect to the bore 24 in the tubular body 16 of the base block mounting 10. As seen in
Referring further to
Referring to
A pair of bolts 100, 102 having bolt heads 104, 106 are threaded through the second and third threaded holes 92, 94 of the extraction nut 86 with the distal end of the bolts 100, 102 engaging the forward surface of the extraction washer 91 which is located on the front plate 52.
With the parts assembled as described above and as depicted in
In the course of breaking the quick change tool holder 28 free from the base block mounting 10 a great amount of force is applied to the threads of the extraction nut 86, the threaded stud 96 and the retaining nut 98. I have found that it is desirable that the threads of these three parts be ACME threads because ACME threads spread the forces applied to the threads over a larger surface area. The threads are therefore able to endure a greater amount of force without failing. Alternately, a larger diameter stud 96 may be used having standard “V” type threads.
Prior to the assembly of the extraction device 50, the distal end of a hand held punch, not shown, can be positioned against the forward surface of the plunger 42 after which the opposite end of the punch is struck with a hammer to break the retaining pin 44 and drive the plunger 42 out of the cylindrical bore 40. Once the plunger 42 has been removed, the extraction device 50 can be assembled around the combined base block mounting 10 and quick-change holder 28.
Referring to
The invention has been described as employing one or more jack screws 100, 102 as a leveraging tool for applying a separating force between the extraction nut 86 and the front plate 52 but there are equivalent leveraging tools that may be substituted for the jack screws 100, 102, such as a hydraulic or pneumatic cylinder. Also, the device may be constructed with the extraction nut 86 and the stud 96 bonded to each other to form a single part with the extraction nut forming an enlarged transverse head 86 of an elongate extraction bolt having a threaded shank 96.
While the present invention has been described with respect to a single embodiment, it will be appreciated that many modifications and variations may be made without departing from the spirit and scope of the invention. It is therefore the intent of the appended claims to cover all such modifications and variations that fall within the true spirit and scope of the invention.
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Dec 04 2006 | The Sollami Company | (assignment on the face of the patent) | / |
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